Adjustable crank-shaft



(No Model.)

' E. BARRATH.

ADJUSTABLB GRANE SHAFT.

9, wm w 1. m w Wo A A Y w B. w M D...

M.. W ,W

QTATEQ lUr-nrnn ADJUSTABLE GRANE' -S-IAFT.

Applieation filed January 9, 188/1.

part of Letters Patent No. 303,790, dated August 19, 1884.

(X0 model.)

;T0 (LZZ who/12, i may concern:

Be it known that I, EDwAnn BAnn'rn, of Brooklyn, in the county of Kings and State of New Yorlc, have invented a new and lniprovcd Adjustahle CranleShat't, of which the following` is a full, clear, and exaet description.

et'erenee is to he had to the acconipanying` drawing's, 'I'orinine' a part ot' this specification, in which similar letters ot' reterence indicate rorrespomlin5I` parts in all the iig'urcs.

Figure 1 is a side elevation, partly in sec tion, of niy ilnprovexnent. Fig. 2 is a seetional end clcvation of the same, taken through the line :c w, Pig. l.. Fig. 3 is a sectional end elevation of the same, takenthrough the line; ;1/ y, Fin. 1. Fig. -t is a plan view of the inalescrew.

The ohjet't of this invention is vto provide eranl'shafts so constrncted that. they can he readily and aecuratehv adjusted to give an)`v desired throw to the crank.

The invention consists in an adjustahle (frank-shall' constrnetod with shz'tft-seet-ions having` upon their adjaceut ends heads pro` rided with eeeentrie female screws having` different diameters and reverse screw-tln'eads, the male serc-ws having ohlong` openings to re ceivc the ends of the eranlc, the serews having ext'erior and interior screw-threads to serow into the female serews of the headsvand upon the ends ot' the crank, and the cranl; having ohlon;` cnds and' inale serew-tln'enls, so that the crank can be readily adjusted and will be secnrel y held. The crank provided with an index pointing to divisionanarks on the head of the shaft-seetion, so that the throw of the shaft will hc aocuratcly indieated, as will he hereina'l'tcr fully descrbed.

represents the parts of the shaft upon the adjacout ends of which are i'orined eircular heads 13. In the adjacent faees of the headsB are forined female screws G, eecentrie to the axis of the shal't A. The serew O ot' one head B is :nade with a left-hand thread, and the scrow O of the other head is niade with a right-hand thread. In the adjaeent faees of the heads B is 'thrined a second pair of t'einalo serows, D, coneentric with and of a larger diameter than the female sercws O, as shown in Figi. l. Ono of'tho serews D is made with a righthand thread and the other with a lefthand thread, and the scrcws O D of each head B are oppositely cut or formcd, respcctively, with right and lefthand threads.

E is a inale serew the thread of which fits into the thread of the female screw O, and which has an ohlong hole, F, through its center to receive the oblong' end G of the Crank II. Upon the erank H, adjaccnt to the oblong` ends G, are forined inale sorews I, which are coneentric with the said oblong` ends G, and eceeutric with the shaft A and the arm of the erank. H. One ot' the serews I has a righthand thread and the other a left-hand thread at opposite heads B.

J is a sercw havingan exterior thread fitting into the female screw D,and an extcrior thread iitt'ing upon the male sercw I. One of the screws J has right-hand threads and the other left-hand threads at oppositeheads B. Vith this construction the threads of the corresponding parts at the two en'ls of the cranh H are the revcrse of each other.

U pon the projecting' outer parts of the screws .T are fornicd polygonal shouldcrs K, to receive a wrench 'for tnrning` the said screws in and out, and upon the Crank H, at the outer ends of the sercws I, are forined polygonal shoulders L, to receive a wrench i'or adjusting the said eranlt. Tith this construction, when the eranl: is to be adjusted to Vary its throw, a wrench is applied to the Shoulders K, and the scrcws J are turned out. The wrench is then applied to the Shoulders L, and the erank H is turned into the dcsired position, the ohlong ends G turnin the male sorews Ein the female serews O. The screws .T are then screwcd in, the,crank H heinsor held stationary, and

'aet as jain'nuts to loel; the serews E and the orank 1:1 in place; or, the screw J and Crank H can be turned at the sanie tinie by using,` two wrenches, one upon the shoulder K and the other upon the shoulder L.

To the shoulder L of the Crank H is attached an index, M, which passes over the serew J, and points to a seale ot'.division-niarks fornicd upon the i'aoo of the head B, to indicate the position ot' the crank H, and thus faoilitate the adjustinent. 71th this construction the erank H can he convenicntly and aceurately :'aljnstjed to give the exaet throw required.

IOO

Having thns deseribed my invention, I elaim as new and desire to secure by Letters Patent- 1. An adjnstable Crankshaft eonstrneted snbstantially as herein shown and described, and eonsisting` of the shaft-seetions having heads provided with eeeentrie female screws of different diameters and reverse serewthreads, the male screw having` oblong Central opening, the serenr having exteror and interior sCreW-threads, and the Crank having 0blong` ends and male sCreW-t111'eads, as set forth.

2. In an adjustable erank-shaft, the Combinaton,wth the shaft-seetions A,`having heads B, provided With eecentrie female serews O D of different diameters and 'reverse serewthreads, of the male sci'ew E, having oblong,` per'- forations, the Crank H, having` oblong ends G and inale serews I, and the serews J, having exterior and interior threads, snbstantially as herein shown and deserbecl,w1iereby the Crank Can be readly adj nsted and Will be seenrely held, as set forth.

3. In an adjnstable Crank-shaft, the combination,with the shaft-seetons A, having heads B, and the Crank H, of the index M, substantially as herein shown and deseribed, Whel'eby the tln'ow of the Crank will be indicated, as set forth.

` EDVARD BARRATH. W'itnesses:

JAMEs T. GRAHM,

EDGAR TATE. 

